Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa97f0d5ad89557…

MALICIOUS

PDF

46.5 KB Created: 2021-06-04 04:10:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4cd4d361f18b8b74d5ad0d1edd16d0e5 SHA-1: 348533ee9d95b1e4661fb3b6ecdfb007a1d2cc6b SHA-256: 7aa97f0d5ad8955709ae8d9dc4a32558c23990a98de1483409a724c083ce95fd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body, though heavily obfuscated, contains references to 'free Robux' and 'game hack', reinforcing the lure. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent, likely leading to further malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/431946152/free-robux-no-downloading-apps-game-hack In PDF document text
    • http://digilib.stimata.ac.id/repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/wurst-commands_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-do-you-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/instantrobux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f0d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F0D 28384 bytes
SHA-256: 1d0163a7e5cc6d3d7ea8b0ef3c15102f6630aad28d315602a4ddd6bff1b48196
font_01_sfnt_off00008fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD5 19404 bytes
SHA-256: 49b6dfa9b56ae39db803e39cb2f1ecc2093e69bc279e239e32c5359198169209

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